At present, the mechanical properties of laterally loaded threaded fasteners with large diameters embedded in timber elements remain unknown. An experimental study of laterally loaded threaded rods with wood screw threads embedded perpendicular to grain in softwood elements (spruce and pine glulam and spruce LVL) is presented in this paper. Embedment tests with the load acting parallel and perpendicular to grain were carried out and the embedment strength and stiffness were quantified. For some test series, the experimental embedment strengths were lower compared to the predictions according to Eurocode 5 in terms of both mean and characteristic values. This finding indicates that the predictions by Eurocode 5 are not always conservative. To investigate the effect of the thread, additional series of embedment tests were carried out with smooth dowels featuring a diameter approximately equal to the core diameter of the threaded rods. Finally, the yielding moment of threaded rods was quantified based on a series of three-point bending tests of threaded rods. The experimentally determined yielding moment was significantly higher than the prediction of Eurocode 5.

目前，嵌入木材元件的大直径横向加载螺纹紧固件的机械性能仍然未知。本文介绍了在软木元件（云杉和松胶合木和云杉 LVL）中垂直嵌入木纹的横向加载螺纹杆的实验研究。进行了载荷平行和垂直于纹理的嵌入试验，并对嵌入强度和刚度进行了量化。对于某些测试系列，就平均值和特征值而言，与根据欧洲规范 5 的预测相比，实验嵌入强度较低。这一发现表明欧洲规范 5 的预测并不总是保守的。为了研究线程的影响，使用直径约等于螺纹杆芯径的光滑销钉进行了一系列额外的嵌入测试。最后，基于一系列螺纹杆的三点弯曲试验，对螺纹杆的屈服力矩进行了量化。实验确定的屈服力矩明显高于欧洲规范 5 的预测。